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ROI calculator

Finance & money

Calculate return on investment percentage and net gain instantly.

Updated

ROI calculator

Calculate return on investment percentage and net gain instantly.

Input format: Line 1=investment, Line 2=return value

Output

Quick start

How to use roi-calculator

Enter input and view computed output.

  1. Step 1
    Enter input

    Paste or type your data in the input box.

  2. Step 2
    Compute

    The tool processes input instantly in your browser.

  3. Step 3
    Use output

    Copy output and continue your workflow.

In-depth guide

ROI calculator guide

Calculate return on investment percentage and net gain instantly. This tool is designed for fast local processing and practical day-to-day use.

Quick start

Paste input, review output instantly, then copy it for your workflow.

Input tips

Use one value per line for structured inputs. Common separators are handled gracefully.

Privacy

Processing runs in your browser tab for the MVP workflow, with no mandatory upload step.

When to use it vs alternatives

Use this tool for quick planning, comparison, and what-if finance scenarios. Use official calculators, a qualified adviser, or source documents before filing taxes, signing contracts, or making irreversible money decisions.

Common pitfalls

  • Confirm rates, compounding frequency, tax year, dates, and rounding before acting on the result.
  • Fees, penalties, inflation, and local rules can make real outcomes differ from simple formulas.
  • Treat results as guidance, not financial, tax, legal, or investment advice.

Frequently asked questions

How is ROI calculated?

ROI equals net gain divided by cost, expressed as a percentage. A 200 gain on a 1000 investment is a 20% ROI.

Does ROI account for time?

No. Plain ROI ignores how long the investment took. Use annualised ROI to compare investments of different durations fairly.

What is the difference between ROI and profit?

Profit is an absolute amount, while ROI is relative to the cost, which lets you compare opportunities of different sizes.

Can ROI be negative?

Yes. If the return is less than the cost, ROI is negative, signalling a loss.

Should I include all costs?

Yes for an accurate figure. Include fees, taxes and ongoing costs, not just the headline purchase price.

Is any data uploaded?

No. All calculations run locally in your browser.

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